On 02/23/10 00:04, Zachary Turner wrote:
Also, for the record, i realize the problem is probably related to variant requiring its bounded types to support the CopyConstructible concept, but my question is more along the lines of whether this requirement can be eliminated or relaxed in the presence of r-value refernces. I.e. Something along the lines of requiring one or more of CopyConstructible, MoveConstructible.
I don't know about r-value references as a solution; however, would one possible workaround be to derive from unique_ptr and then in the derived unique_ptr provide a copy CTOR? Although not for boost::variant, something like that was done in composite_tagged_seq.recur.test.cpp in composite_tagged_seq.zip in http://www.boostpro.com/vault/index.php?&directory=Data%20Structures. The derived unique_ptr was: boost::composite_tagged_recur::unique_ptr HTH. -regards, Larry